146 HELCIONISCUS. 



bands peculiarly bi-forked, or diagonally linearly streaked. Interior 

 subtransparent, horny. Philippine Is" (five.) 



Var. orientalis Pilsbry. PI. 72, figs. 76, 77. 



Shell more solid, the central area of the interior whitish or more 

 or less stained with olive or orange. 



Viti Islands (A. Garrett). 



Var. DISCREPANS Pilsbry. PI. 72, figs. 78, 79, 80. 



Surface with growth-lines but no radiating sculpture whatever. 

 Soiled white, with purple-brown rays torn into oblique shreds. 

 Length 29, breadth 24, alt. 10 mill. 



Probably a distinct species. The two specimens I have seen are 

 unlike any described Helcioniscus in their smoothness and lacerated 

 rays. 



H. CAPENSIS Gmelin. PI. 16, figs. 15, 16, 17. 



Shell ovate, thin, depressed-conical ; dull white, variously painted 

 with brown radiating bands and spots ; radiately striated, the stride 

 close, equal, granulose ; vertex acute, erect, situated at about i the 

 length ; margin denticulated. 



Interior yelloivish-silvery, with a pearly luster, having rays and 

 spots of brown ; central spatula, brown or orange, rarely whitish, 

 but always marked with white under the vertex and a brown spot in 

 front. (Krauss.*) 



Length 39, breadth 29 mill. 



Natal. 



P. capensis GMEL, Syst., p. 3720. KRAUSS, Die Siidafric. Moll, 

 p. 53, t. 3, f. 13. 



There is a white area in the depth of the interior, having an 

 orange or brown bar across it, as in pi. 16, figs. 16, 17 ; or the white 

 is reduced to a bar in the same place. 



Compare P. rota Gmel. 



H. NOVEMRADIATUS Quoy & Gaimard. PI. 30, figs. 55, 56, 57, 58. 



Shell low-conic, rounded-oval, rather thin but solid, the apex 

 slightly in front of the center. Surface lusterless, closely, finely 

 striated radially, the stride somewhat granulose, often subobsolete ; 

 growth-lines! obvious or obsolete. Whitish, broadly rayed with 

 olive-brown or dull rust-red. 



Interior layer translucent, iridescent, conspicuously showing the 

 rays of the outside, which become vivid brown at the edge ; central 



